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Impact of Control Channel Design on Cooperative Spectrum Sensing in Opportunistic Spectrum Access Networks
"... Abstract—In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., common spectrum holes unused by licensed Primary Users (PUs). Typically, an interferencefree CC is unrealistically assumed in ..."
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Abstract—In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., common spectrum holes unused by licensed Primary Users (PUs). Typically, an interferencefree CC is unrealistically assumed
AdS3 Black Holes and a Stringy Exclusion Principle
, 1998
"... The duality relating nearhorizon microstates of black holes obtained as orbifolds of a subset of AdS3 to the states of a conformal field theory is analyzed in detail. The SL(2, R)L ⊗ SL(2, R)R invariant vacuum on AdS3 corresponds to the NSNS vacuum of the conformal field theory. The effect of the ..."
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Cited by 322 (25 self)
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of the orbifolding is to produce a density matrix, the temperature and entropy of which coincide with the black hole. For string theory examples the spectrum of chiral primaries agrees with the spectrum of multiparticle BPS states for particle numbers less than of order the central charge. An upper bound on the BPS
Split States, Entropy Enigmas, Holes and Halos
, 2007
"... We investigate degeneracies of BPS states of Dbranes on compact CalabiYau manifolds. We develop a factorization formula for BPS indices using attractor flow trees associated to multicentered black hole bound states. This enables us to study background dependence of the BPS spectrum, to compute e ..."
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Cited by 235 (22 self)
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We investigate degeneracies of BPS states of Dbranes on compact CalabiYau manifolds. We develop a factorization formula for BPS indices using attractor flow trees associated to multicentered black hole bound states. This enables us to study background dependence of the BPS spectrum, to compute
holes
"... The object of this contribution is to provide an illustration of the impact of modified dispersion relations with respect to relativistic or hydrodynamic ones. The example studied here is the quasinormal mode (QNM) spectrum of a toy model for an acoustic black hole in a (1+1)dimensional flow of a ..."
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The object of this contribution is to provide an illustration of the impact of modified dispersion relations with respect to relativistic or hydrodynamic ones. The example studied here is the quasinormal mode (QNM) spectrum of a toy model for an acoustic black hole in a (1+1)dimensional flow of a
holes
, 2001
"... Abstract. We have performed Monte Carlo simulations of Compton upscattering of lowenergy photons in an accretion disk around a Schwarzschild black hole. The photons gain energy from the rotational motion of the electrons in the disk. The upscattering occurs near the black hole horizon, where the fl ..."
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the flow velocity of the electrons approaches the speed of light. We show that this type of bulkflow Comptonization can produce powerlaw Xray spectra similar to the ones observed in blackhole Xray transients in the high/soft state, i.e., a soft bump dominating the spectrum below ∼ 10 keV and a power
Hole
"... We present a new backward evolution model for galaxies and AGNs in the infrared (IR). What is new in this model is the separate study of the evolutionary properties of the different IR populations (i.e. spiral galaxies, starburst galaxies, lowluminosity AGNs, “unobscured ” type 1 AGNs and “obscured ..."
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and luminosity distributions, luminosity functions). By decomposing the SEDs representative of the three AGN classes into three distinct components (a stellar component emitting most of its power in the optical/nearIR, an AGN component due to hot dust heated by the central black hole peaking in the mid
Quantum Geometry and Black Hole Entropy, Phys
 Rev. Lett
, 1998
"... A ‘black hole sector ’ of nonperturbative canonical quantum gravity is introduced. The quantum black hole degrees of freedom are shown to be described by a ChernSimons field theory on the horizon. It is shown that the entropy of a large nonrotating black hole is proportional to its horizon area. ..."
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Cited by 104 (20 self)
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A ‘black hole sector ’ of nonperturbative canonical quantum gravity is introduced. The quantum black hole degrees of freedom are shown to be described by a ChernSimons field theory on the horizon. It is shown that the entropy of a large nonrotating black hole is proportional to its horizon area
The Perturbation Spectrum of Black Holes in
, 1998
"... The near horizon geometry of fourdimensional black holes in the dilute gas regime is AdS3 × S2, and the global symmetry group is SU(2) × USp(6). This is exploited to calculate their perturbation spectrum using group theoretical methods. The result is interpreted in terms of three extreme M5branes ..."
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branes, orthogonally intersecting over a common string. We also consider N = 8 black holes in five dimensions, and compute the spectrum by explicit decoupling of the equations of motion, extending recent work on N = 4 black holes. This result is interpreted in terms of D1 and D5branes that are wrapped
� Identify spectrum holes
"... � Why DSA? A new paradigm for wireless communications � DSA networks and functionalities � Experimental results: distributed vs. centralized spectrum sharing approaches � Summary & conclusions ..."
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� Why DSA? A new paradigm for wireless communications � DSA networks and functionalities � Experimental results: distributed vs. centralized spectrum sharing approaches � Summary & conclusions
Results 1  10
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